How to put a carriage return and a feed line in a string

Hi,

I need to these two sentences in a string. Can anybody tell me how to do this?

For example:

data: var_string(50) type c.

var_string = 'my first line

my second line'.

It returns an error, of course. But I need to be able to write the following when I write the var_string variable:

my first line

my second line

Thanks in advance.

Regards.